¶ The Vision and the Voice chronicles the mystical journey of Aleister Crowley as he explored the 30 Enochian Aethyrs originally developed (or discovered) by Dr. John Dee and Edward Kelley in the 16th century. These visions took place at two times: in 1900 during his stay in Mexico, and later in 1909 in Algeria in the company of poet Victor Benjamin Neuburg. Of all his works, Crowley considered this book to be second in importance behind The Book of the Law, the text that established his religious and philosophical system of Thelema in 1904. Originally issued in THE EQUINOX, Vol. 1, No. 5 (1911), the lengthy Commentary was first published in the Sangreal Foundation edition of 1972; this edition includes THE BARTZABEL WORKING, THE AB-UL-DIZ WORKING, & THE PARIS WORKING, plus Commentaries on them and some Diary extracts.